<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>使用带有一个值的简写内边距</title>
</head>

<body>
    <style>
        div {
            border: 1px solid black;
            padding: 25px;
            background-color: lightblue;
        }
    </style>
    <h1>简写的内边距属性 - 1 个值</h1>
    <div>这个 div 元素的上、下、左、右内边距均为 25 像素。</div>
</body>

</html>